android studio:ProgressBar 進度條

 一、xml設定 

<ProgressBar

    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyle"
    android:layout_width="100sp"
    android:layout_height="100sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.498"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.41" />

二、宣告類型及引用

private ProgressBar pb;

pb = (ProgressBar) findViewById(R.id.pb);


三、設定進度表進度

pb.setProgress(pg);


四、進度條顯示及隱藏
pb.setVisibility(View.GONE);
pb.setVisibility(View.VISIBLE);